Moments Flashcards
(9 cards)
1
Q
State the principle of moments
A
sum of clockwise moments = sum of anticlockwise moments
2
Q
Moment equation
A
moment = force x perpendicular distance from pivot
2
Q
what is meant by a moment of a force
A
The turning effect of a force about a pivot
3
Q
what is the centre of gravity on an object
A
the point through which the weight of an object acts
4
Q
why would the minimum force needed to lift something be smaller than its weight
A
the lifting force is further from the axis of rotation than the weight
5
Q
from what point does weight act?
A
centre of gravity
6
Q
examples of rotation from moment
A
- child on see saw
- turning handle of spanner
- using a screwdriver to open a tin of paint
- using scissors
7
Q
define moment
A
the turning effect force about a pivot
8
Q
what is momentum measured in
A
nm
